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Schedule of Allowance for Credit Losses (Details) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Insurance assignments, allowance for credit losses, beginning |  | $ 1,517,783 | $ 1,587,525 | $ 1,536,926 | $ 1,553,836
Insurance assignments, allowance for credit losses, change in provision | [1] | 257,253 | 242,046 | 551,051 | 492,613
Insurance assignments, allowance for credit losses, charge-offs |  | (294,004) | (294,247) | (606,945) | (511,125)
Insurance assignments, allowance for credit losses, ending |  | $ 1,481,032 | $ 1,535,324 | $ 1,481,032 | $ 1,535,324
[1] | Included in other expenses on the condensed consolidated statements of earnings

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- Definition Allowance for credit losses,premiums and other receivables change in provision. + References No definition available. + Details
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Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Allowance for credit losses premiums and other receivables chargeoffs. + References No definition available. + Details
Name: | SNFCA_AllowanceForCreditLossesPremiumsAndOtherReceivablesChargeOffs
Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The valuation allowance as of the balance sheet date to reduce the gross amount of receivables to estimated net realizable value, which would be presented in parentheses on the face of the balance sheet. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-4 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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